Azimuthal angle dependence of the longitudinal spin polarization in relativistic heavy ion collisions

Sun, Yifeng; Ko, Che Ming

doi:10.1103/physrevc.99.011903

Title: Azimuthal angle dependence of the longitudinal spin polarization in relativistic heavy ion collisions

Journal Article · Tue Jan 22 00:00:00 EST 2019 · Physical Review C

DOI:https://doi.org/10.1103/physrevc.99.011903· OSTI ID:1612272

Sun, Yifeng ^[1]; Ko, Che Ming ^[1]

Texas A & M Univ., College Station, TX (United States)

The longitudinal quark spin polarization along the beam direction in noncentral relativistic heavy ion collisions is studied in the chiral kinetic approach. Its azimuthal angle dependence in the transverse plane of the collision is found to have a quadrupole structure as in studies from hydrodynamic and transport models based on the relativistic spin-vorticity coupling in a thermodynamically equilibrated hadronic matter at kinetic freeze-out. The direction of the quark longitudinal spin polarization is, however, opposite to that from these models, and this is due to the axial charge current induced by the transverse component of the vorticity field in the chiral kinetic approach. Furthermore, our finding is consistent with the azimuthal angle dependence of the longitudinal spin polarization of Λ hyperons, which is mainly determined by that of the strange quark, recently measured in the experiments by the STAR Collaboration at the BNL Relativistic Heavy Ion Collider.

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Research Organization:: Texas A & M Univ., College Station, TX (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: SC0015266

OSTI ID:: 1612272

Alternate ID(s):: OSTI ID: 1491607

Journal Information:: Physical Review C, Vol. 99, Issue 1; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 46 works

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Cited By (4)

Microscopic description for polarization in particle scattering Zhang, Jun-jie; Fang, Ren-hong; Wang, Qun Physical Review C, Vol. 100, Issue 6 https://doi.org/10.1103/physrevc.100.064904	journal	December 2019
A microscopic description for polarization in particle scatterings Zhang, Jun-jie; Fang, Ren-hong; Wang, Qun arXiv https://doi.org/10.48550/arxiv.1904.09152	text	January 2019
Feed-down effect on $Λ$ spin polarization Xia, Xiao-Liang; Li, Hui; Huang, Xu-Guang arXiv https://doi.org/10.48550/arxiv.1905.03120	text	January 2019
Local spin polarization in high energy heavy ion collisions Wu, Hong-Zhong; Pang, Long-Gang; Huang, Xu-Guang arXiv https://doi.org/10.48550/arxiv.1906.09385	text	January 2019

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